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Interface

Connector

Clock

Maximum

Throughput

Length
(single ended)

Length LVD

Length HVD

Devices

SCSI-1

IDC50; Centronics C50

5 MHz (8-bits)

5 MB/s

6 m

NA

25m

8

Fast SCSI (SCSI-2)

IDC50; Centronics C50

10 MHz (8-bits)

10 MB/s

1.5-3 m

NA

25m

8

Fast-Wide SCSI (SCSI-2; SCSI-3 SPI)

2 x 50-pin (SCSI-2);
1 x 68-pin (SCSI-3)

10 MHz (16-bits)

20 MB/s

1.5-3 m

NA

25m

16

Ultra SCSI (SCSI-3 SPI)

IDC50

20 MHz (8-bits)

20 MB/s

1.5-3 m

NA

25m

8

Ultra Wide SCSI (SCSI-3 SPI)

68-pin

20 MHz (16-bits)

40 MB/s

1.5-3 m

NA

25m

16

Ultra2 SCSI (SCSI-3 SPI)

50-pin

40 MHz (8-bits)

40 MB/s

NA

12m

25m

8

Ultra2 Wide SCSI (SCSI-3 SPI)

68-pin; 80-pin (SCA/SCA-2)

40 MHz (16-bits)

80 MB/s

NA

12m

25m

16

Ultra3 SCSI (SCSI-3 SPI)

68-pin; 80-pin (SCA/SCA-2)

40 MHz DDR (16-bits)

160 MB/s

NA

12m

NA

16

Ultra-320 SCSI

68-pin; 80-pin (SCA/SCA-2)

80 MHz DDR (16-bits)

320 MB/s

NA

12m

NA

16

Ultra-640 SCSI

68-pin; 80-pin

160 MHz DDR (16-bits)

640 MB/s

16